asynchronous messages and answer dialog

[Brian Yennie]

> To me it is more logical to test for the existence of the window.  
> There are many situations where I may have a stack open but not have 
> it's window open (e.g. a stack in use).  I think 'the windows' should 
> only return stacks which are displaying windows on screen.

I can see how that would appear so... there is one addition that may 
help: test the 'visible' property of the window.

function windowIsOpen tWindow
     return ((there is a window tWindow) AND (the visible of window 
tWindow))
end windowIsOpen

- Brian